The remake is modeled after Metroid: Zero Mission, the GBA remake of the original Metroid. It features:

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Metroid Zero Mission style gameplay

Map system

Updated enemy AI

Minibosses

New areas

Challenging Metroid

Stackable beam system

Completely redrawn enemy and Metroid sprites

Log system with non-intrusive narrative

High quality soundtrack

Project AM2R is in no way licensed or endorsed by Nintendo, and there’s every possibility that their lawyers will send the developers a cease-and-desist, especially since the original game is still available for purchase on the 3DS’ Virtual Console.

EDIT: In fact, Nintendo is already sending out cease-and-desist notifications to some sites hosting the file:

Friends: Nintendo has hit us (meaning, our website host) with a DMCA takedown notice. We can no longer host the AM2R file. Sorry!